Well packer



May 13, 1958 Filed Aug. 25, 1955 J. E. EDWARDS WELL PACKER 2 Sheets-Sheet l dac/4 E. fcz/wof/c/J INVENTOR.

May 13, 195B Filed Aug. 23, 1955 J. E. EDWARDS WELL PACKER 2 Sheets-Sheet 2 HHH (/a-C" f. fc/wd/C/J INVENTOR.

United States Patent O WELL PACKER Jack E. Edwards, Houston, Tex.

Application August 23, 1955, Serial No. 530,033

6 Claims. (Cl. 16d-130) The present invention relates to packers used in oil, gas, and other wells and, more particularly, relates to an improvement in a packer of the general type described in my copending application, Serial No. 392,139, tiled November 16, 1953, now Patent 2,772,740, for a well packer.

In the production of oil, gas and other wells, well packers are commonly used, for example, for providing a seal in the well bore for excluding drilling fluid normally present in the well bore from a conned formation traversed thereby so that oil, gas and the like may be permitted to 'low upwardly through the string of pipe to which the packer is attached to the surface of the ground. Well packers are used in conjunction with washing-in a well, making formation tests, as Well as providing a packed-off portion in the well bore for other purposes.

The well packer of my copending application referred to above, overcomes certain problems therein referred to and in general provides a well packer which may be set and removed, or re-set and removed from a well bore, and which permits maximum circulation through and about the packer as it is being lowered into or raised from the well bore.

The present invention is directed toward an improvement in a packer of the type of my copending application in providing means for automatically locking the packer in circulating position upon movement of the mandrel in one direction, yet which means are readily releasable by other manipulation of the mandrel for setting the packer.

t is therefore a major object of the present invention to provide an improved well packer which includes means for automatically locking the mandrel in a eirculating position or a closed position, at the option of the operator, by simple upward movement of the mandrel and which may be released from either of these two positions by rotation of the mandrel.

Another object of the present invention is the provision of an improved well packer which is automatically locked in circulating position or pumping out position by simple upward movement of the mandrel causing threads associated with the mandrel riding over and engaging complementary threads on an associated element and permitting release of the locking action by unthreading the mandrel from its associated element.

It is yet a further object of the present invention to provide an improved well packer of the above character which may be manufactured, maintained and repaired economically and which is rugged and durable in use.

Other and further objects, features and advantages of the present invention will be apparent from the following description of an example of the invention, given for the purpose of disclosure, taken in conjunction with the accompanying drawings, where like character references designate like parts throughout the several views, and Where Figure l is a side elevation, partly in section, of an apparatus constructed according to the present inven- '2,834,414 Patented May 13, 1958 rice 2 tion, the parts being illustrated in position when the packer is lowered or raised in the well bore.

Figure 2 illustrates the well packer of Figure 1 in set or anchored position in a well casing for the purpose of washing in a well, conducting a test, and the like, and

Figure 3 is an enlarged, fragmentary side elevational View, partly in section, illustrating the lower portion of the apparatus of Figures l and 2 and showing the parts in position so that pump pressure may be applied below the well packer for facilitating and aiding in the removal of the well packer from the well bore.

The well packer of the present invention is well adapted for use in washing-in wells and, for purpose of disclosure, an example of the invention is described in connection with washing-in operations. Other uses and adaptations, of course, will suggest themselves to those skilled in the art.

Referring now to the drawings, and particularly to Figure l, the reference numeral 10 designates the body of the well packer into which slidably extends the tubular mandrel 12 so that relative movement is permitted between the body 10 and mandrel 12 by which the tool` is actuated, as will be apparent later. The upper end of the mandrel 12 is threadedly or otherwise secured to a string of pipe 14 which extends to the surface of the earth, not shown, by means of the coupling 16, which coupling also includes a valve member as will be apparent later.

The lower end of the mandrel 12 is threadedly or otherwise connected to a length of pipe 18, which may be termed a tail piece, by means of coupling 20, which, similarly to the coupling 16, also includes a valve element as will be made apparent later.

The body 10 is substantially tubular or cylindrical, and as seen in the drawings, is recessed at the inner portion of its upper end, as at 21, which recess has the downwardly and inwardly tapered valve seating surface 22 for a function described later.

Surrounding the upper portion of body 10 and slidable thereon is the packing band 24 which may be of any suitable material, such as lead, rubber, neoprene or some other material which may be expanded to provide a seal. Preferably, the packing band 24 is formed of lead or lead mesh inasmuch as lead may be expanded into sealing engagement with the inner walls of the casing 26 and will not become vulcanized to the casing at the pressures and temperatures occurring in deep wells, which sometimes happens when using rubber or some other flexible or plastic material.

The packing band 24 is coniined by the downwardly facing shoulder 28 proximate the upper end of the body 10 and the upwardly facing shoulder 30 disposed at the upper end of the slip and packing expander 32, the latter being slidably secured at its upper end to the body 10 by the pins 34a threaded to the body and received in the slots 35.

The slip and packer expander 32 has its outward surface tapered downwardly and inwardly and slidably engages the reduced external portion 34 of the body 10 and the downwardly and inwardly tapered undersurface 36 of the slips 3S disposed about the body 10. The outer slide surfaces of the slip and packer expander 32 are slidably secured to the inner surfaces 36 of the slips in any conventional manner such as the dovetail arrangement 39 and, in general, the slip expander may be conical in configuration. The lower portion of the slips 38 are secured to the collar 40 surrounding the body 10 such as by the dovetail arrangement 41. The manner of securing slips to the body, the collar, and to a slip expander or cone is conventional, may be accomplished in any usual and customary manner, and no detailed description thereof is deemed necessary.

The collar 40 includes an enlarged shoulder of a sleeve member 42 which is slidably disposed about the body 10 at its lower and reduced diameter portion 34 and which has the friction or wiper blocks 44 secured thereto by means of the ears or projections 46 which are secured to the sleeve member 42, such as by means of the screws 4S or in any suitable manner. The friction blocks 44 have the projecting ears 50 which engage under the ears 46 and retain the friction blocks 44 in the pockets 45 formed in the sleeve member 42. These friction blocks 44 have conventional springs 47 which yieldingly urge the friction blocks outwardly into frictional engagement with the inner wall of the casing 26 so that the sleeve member 42 and associated parts may remain relatively stationary when the well packer is released for actuation and the mandrel 12 and the body 10 might be moved to eiect the setting and releasing operations of the well packer.

The above described elements are the same as in the packer described in my copending application now Patent 2,772,740. Turning now to the improved releasable automatic locking means at the lower end of the tool, the lower portion of the sleeve 42 which is in effect the outward body member of the lower portion of the well packer, has the longitudinally or axially extending slots 52 for slidably receiving the pins 54 secured to the bo'dy nose piece 56, which body nose piece 56 is threaded or otherwise secured to the lower end of the reduced portion 34 of the body 10. Thus, relative axial movement is permitted and rotation is prevented between the sleeve member 42 and the lower portion of the reduced diameter section 34 of the body 10 for the purpose of expanding and retracting the slips and packer as will be apparent later.

In order that the parts of the well packer may be releasably locked in the positions shown in Figure l and Figure 3, the lower coupling 20, which is secured to the lower end of mandrel 12, such as by the complementary threads 58, contains externally thereof circumferentially spaced spring loaded externally threaded latches 60 disposed in the pockets 64 which latches 60 are designed to cooperate with the internal threads 62 at the lower end of sleeve 42. K

Each of the latches 60 is yieldingly forced outwardly in a radial direction from its pocket 64 in the coupling 20 and this may be accomplished by any conventional means, such as the coil spring 66. On the outer face each of these latches 60 are the thread segments 68 which are designed to complement and engage the internal threads 62 on the sleeve 42. These threads 68`and 62` are so directed that when the coupling 20 is lifted upwardly with respect to sleeve-member 42 from the position shown in Figure 2 to that shown in Figure 1, the latch 60 will be forced inwardly against the action of the spring 66 and the threads 62 will ratchet over the threads 68. Any downward movement of the coupling 20 from the position shown in Figure l is prevented because of this same ratchet-like action. The latches 60 are prevented from projecting radially outward from their pockets 64 to such an extent that they interfere with the lower end of the sleeve member 42 and will not ride over threads 62 by any suitable means not shown.

To lower the mandrel 12 and its coupling 20 from the positions shown in Figure l to the position shown in Figure 2, the coupling 20 is unlatched from the sleeve member 42 by rotation of the coupling 20 with respect to the sleeve member 42 thereby unthreading the latches 60 therefrom.

It is obvious from the structure disclosed in Figure 3 that the coupling 20 could also be raised from the position shown in Figure 2 to that shown in Figure l by lrftrng the coupling 20 until its .latches 60 contact the threads 62` on the lower end of the sleeve member 42 and then rotate the coupling 20 through its mandrel 12 so that the coupling is threaded to sleeve member 42 if desired.

As best seen in Figure 3, a valve surface 70 is provided on the lower end of the body nose piece 56 and is complementary to a cooperating valve surface 72 provided on the upper end of the lower coupling 20. The valve surfaces 70 and 72 preferably are ground surfaces to effect a seal therebetween or, if desired, usual packing means may be provided upon engagement of the surfaces to effect a seal. Thus, when the valve surfaces 70 and 72 are engaged, as in Figure 3, uid in the annular passageway 78 between the mandrel 12 and body 10 cannot escape from the annular passageway 78 through slots 52 to the exterior of the packer or ow in the opposite direction through the packer.

The upper interior portion of the coupling 20 is counterbored, as at 74, to receive the coiled compression spring 76 which is compressed between the lower shoulder 79 internally of the coupling 20 and the stop ring 80 proximate the upper end of the coupling 20. The stop ring S0 is held in place with limited longitudinal sliding movement being permitted by a combination of pins 82 in the coupling 20 extending into longitudinal slots 84 disposed in the stop ring 80. Thus, when the tool is in the position illustrated in Figure 3, the stop ring is forced downwardly overcoming the action of spring 76 and the valve surfaces 70 and 72 are permitted to seat in sealing engagement. However, when the tool is in the position illustrated in Figure l the valve surfaces 70 and 72 are spaced from one another and the spring 76 forces the stop ring 80 upwardly until the lower ends of the slots 84 strike the pins S2. When in the position illustrated in Figure 1 the upper portion of the stop ring 80 is perforated and has passageways 86 to permit the passage of tiuid through the upper portions of the stop ring 80 from the annular passageway 78 between the mandrel 12 and the body 10 past the spaced valve surfaces 70 and 72, and through the slots 52 into the interior of casing 26. With this construction, when the pipe 14 extending to the surface of the earth is pulled upwardly causing the mandrel 12 and coupling 20 secured thereto to rise from the position shown in Figure 2, the stop ring 80 will abut the valve surface 70 of the body nose piece 56 before the threads 68 on latches 60 engage in the threads 62 at the lower end of the sleeve member 42. Upon further upward movement of the mandrel 12 the body 10 will be moved upward relative to the sleeve member 42 through the contact of the stop ring 80 on this valve surface 70 causing retraction of the packing band 24 and upward movement of the slip and packing expander 32 so that the slips 38 are released. If the upward force on the mandrel 12 necessary to release the slips 38 and the packing band 24 is greater than the force of the compression spring 76, which is often the situation, the stop ring 80 is depressed by the valve surface 70 allowing the valve surface 72 on the upper end of the lower couplrng 20 to come in Contact with and force against valve surface 70. vThis action closes the passageway 78 and the tool is then in the position illustrated in Figure 3. Further upward force to release the slips 38 and packing band 24 may be applied by greater upward force on the mandrel through the string of pipe 14 and by pump pressure applied to the lower portion of the packer, as will be presently described.

To limit the extent of the upward movement of the mandrel 12 and body 10 relative to the sleeve member 42 when the packer is being pumped loose or jarred loose., as will be described later, a positive stop is formed at the lower end of the sleeve member 42 and the external lower portion of coupling 20 which positive stop is here shown as the lower end 88 on the sleeve member 42 cooperating with a complementary shoulder 90 disposed externally of the lower portion of the coupling 20, which lower end 88 and shoulder 90 are designed to meet at the time the slip and packing expander 32 is moved upwardly enough to release the slips 38. Of course, other types of positive stops could be employed but this one is satisfactory. t

The lower portion of the upper coupling 16 secured to the upper end of the mandrel 12 has the `downwardly and inwardly tapered surface 92 which engages the cooperating valve surface 22 and these surfaces may be ground to effectively provide a seal. Of course, packing means may be utilized in place of these ground valve surfaces and, if desired, a packing ring 94 may be disposed within the recessed portion 21 at the upper end of body 10 so that when the mandrel 12 is in a lower position, as illustrated in the Figure 2, the packing ring 94 sealingly engages the portion of the coupling 16 above the valve surface 92. Thus, when the valve surfaces 92 and 22 are engaged, flow of uid through the annular passageway 78 is prevented.

lt should be noted that the annular passageway 78 disposed between the outer surface of the tubular mandrel 12 and the tubular body 10 is unrestricted along its length, which is advantageous in permitting circulation through the device when raising and lowering the well packer in a well bore, the well bore normally being lled with drill uid. Also, when the mandrel 12 is in an elevated position as is seen in Figure 3, the lower valve surfaces 70 and 72 are in engagement closing this passage 78 from below and when the mandrel is in the lower position, as seen in Figure 2, this passage is closed from above by the valve surfaces 92 and 22 engaging at the upper portion of the tool. When going into and out of the hole, the circulation passage 78 is opened to the well iiuid in the well bore by the latch 60 preventing the seating at the upper end of the packer of the valve surfaces 92 and 22 and the spring 76 preventing the seating of the valve surfaces 70 and 72 at the lower end of the body litt, as shown in Figure l.

In a washing-in operation the well bore is filled with relatively heavy drill uid and it is desirable to pack or seal ott the drill fluid in the casing of the well bore above 'the formation sought to be produced by relieving the hydrostatic pressure of the drill lluid so that the pressure in the formation may urge the pore content thereof into the well bore and up the interior of a string of pipe to the surface. Assuming that a well is to be washed in with the improved well packer of the present invention, n operation the improved well packer is lowered into the casing 26 in a well bore on the string of pipe 14 from the surface of the earth and the parts are in the position illustrated in Figure 1. During this time lluid may freely circulate through the packer. When the well packer is lowered in casing 26 to a point where it is desired to seal or pack off a section of formation for washing in the well (or any other desired use), the string of pipe 14 and the mandrel 12 connected thereto are rotated to the right to unthread the latches 60 from the sleeve member 42. The mandrel 12 is then lowered until the upper valve surface 92 engages the valve surface 22 at the upper portion of the body 10. The sleeve member 42, the body and associated parts are maintained substantially stationary in the casing 26 at this point due to the friction blocks 44 frictionally engaging the inner wall of the casing 26. There may be some relative movement of the body 10 and the sleeve member 42 until such time as the slips 38 engage the inner wall of the casing 26. When the valve surface 92 engages the valve surface 22 at the upper portion of the body 10 further downward movement of the string of pipe 14 and the mandrel 12 connected thereto causes a downward movement of the body 10 and the reduced diameter portion 34 thereby sliding the conical slip expander 32 downwardly with respect to the slips 38, the latter being maintained in substantially stationary position due to their engagement and connection with the sleeve member 42 which is held stationary by the friction blocks 44, thereby expanding or moving the slips 38 radially outwardly into frictional engagement with the inner wall of the casing 26. When the slips 38 have expanded into frictional engagement with the inner wall of the casing 26, the slip expander is fixed against further downward movement and continued downward movement of the mandrel effects further downward movement of the upper portion of the body 10 and the reduced diameter section 34 thereby compressing the packing 24 between the shoulders 28 and 3i) causing it to expand into sealing engagement with the inner wall of the casing 26.

When the well packer is set or anchored in packing or sealing position in the casing 26 as just described, the parts will be in the position illustrated in `Figure 2. It is,` to ybe noted that a complete and effective seal is provided of the well fluid above the packer from that below so`that the formation traversed by the bore hole to be washed in is relieved of the hydrostatic pressure of the column of fluid above it. While not illustrated, the pipe section 18 or tail pipe may be perforated, slotted, open 4at its lower end and the like for the admission of uid from the formation into the inner passage of the pipe 18, the tubular mandrel 12 and the pipe 14 extending to the surface so that a well might be washed in, tested and the like.

ln Washing in a well, the string of tubing 14 may be elevated thereby raising the mandrel 12 to an intermediate position in which the valve surfaces 92 and 22 are separated and the valve surfaces 70 and 72 have not become engaged so that the passage 78 is open while leaving the packer set or anchored in the casing 26. Water may then be circulated down the annular space between the pipe 14 and the casing 26, through the passageway 78, down below the packer, into the tail pipe 18, and up through the passages in the tubular mandrel 12 and the pipe 14. This relieves the hydrostatic pressure of the heavier drill uid against the face of the formation so that the pore content thereof may be urged into the well bore, the tail pipe 1S, and the internal passages in the tubular mandrel 12 and the pipe 14 to the surface.

Of course, if desired, this circulation could be reversed, that is, flowed downwardly through the pipe 14, tubular mandrel 12, tail pipe 18, andup through the passage 78 and the annular space between casing 26 and the pipe 14.

It is to be noted that the mandrel 12 may be a single length, although it may be comprised of a plurality of lengths of ordinary upset tubing and that a considerable stroke may be obtained. A long stroke is advantageous in that after the packer has been set the pipe 14 may be elevated above the rotary table at the surface of the earth and a conventional tubing anchor installed. The packer may be pressure tested and the usual blowout preventer may be removed and the well ttings, generally termed the Christmas tree, may be made at the surfaceall with the packer set. In addition, the long stroke is advantageous in jarring the well packer loose in the event it lbecomes stuck.

After the desired operations have been performed with the well packer in anchored position, the pipe 14 may be elevated so that the lower portion of the mandrel 12 is in the position illustrated in Figure 3 which causes the valve surfaces 7i) and 72 to engage thereby closing the circulating passage 78 from below. Fluid under pressure may then be pumped in the interior of the pipe 14, through the tubular mandrel 12, and out of the lower end of the tail pipe 18 below the packer to aid in releasing the well packer from the casing. It is noted that a considerable amount of pressure will be brought to bear upon the lower portion of the coupling 20 below the shoulder 90 and on the lower .end of the tail pipe 18 which, through the complementary valve surfaces 70 and 72, urges the mariani inner reduced diameter section 34 iof 'the body upwardly with respect to the s1eevemember'42 which ismaintained substantially stationary by meansvof the friction blocks 44 frictionally engaging the walls of the casing 26. Such upward movement of body relative to the sleeve member 42 causes retraction of the packing band 24 and upward movement of the slip and packing expander 32 so that the-slips 38 are released. This relative movement 'betweensleeve 42 and the reduced portion '34 of body 10 is stopped, after suicient relative movement to Yrelease the packer, 'by the meeting of the shoulder 88 at the lower end of the sleeve member 42 and the vshoulder 90 on the coupling 20, which form 'the positive stop. When the slips 38 and the packing lband 24 are released the spring 76 forces the valve surfaces 70 and 72 apart and the 'tool is then in the position illustrated in Figure 1 i-n which fluid may circulate through the annular passageway 78. With rthe tool in this lposition it can then be moved from the well bore or raised or lowered to a new location for the purpose of packing off a different section of the casing 26 or making a test or whatever operation may be desired in which it is desirable to use a well packer.

As mentioned above, the tubing 12 maybe of considerable length, for example, as much as l28 feet or more may be provided to jar the packer loose in addition to the pumping action described. That is, the stop shoulders 88 and 90 become anvil and hammer surfaces, respectively.

The present packer is advantageous in that the tubing may be elevated above the rotary table,`at the surface, to install conventional tubing anchors with the blowout preventers still connected, all while the packer is set. Also, in using a full joint of upset tubing, which is approximately 30 feet, a full opening through the central portion ofmandrel 12 of the tool is provided and ease of operation is facilitated in the setting and pulling of the tubing or mandrel. Also, if desired, the present well packer permits the removal of blowout preventers and making up of the well fittings at the surface, known as the Christmas tree in the art, with the packer set.

The present invention, therefore, is well suited to attain the objects set forth and has the advantages mentioned as well as others inherent therein. t

While only a single embodiment of the invention is given for the purpose of disclosure, changes in details and rearrangement of parts will readily suggest themselves to those skilled in the art which are encompassed within the spirit of the invention and the scope of the appended claims.

What is claimed is:

1. A well vpacker for use in a casing comprising, a generally tubular body, a packer element secured about the body, a sleeve member slidably disposed about the body and extending beyond one end thereof, slips secured to the sleeve member and disposed about the body for radial expansion and contraction into and out of frictional vengagement with an inner wall of a casing, a slip expander slidably secured to the body and engaging the slips, said slip expander and slips having guide and slide surfaces for such radial expansion and contraction of said slips upon relative movement of the slip expander and slips, shoulders on the body and the slip expander abutting and confining the packer element whereby upon relative movement of said body and sleeve member in one direction said slips are expanded radially into frictional engagement with the wall of the casing thereby xing said slip expander against further movement in said one direction, continued movement of said body in said one direction compressing said packer element between said shoulders and expanding the packer element into sealing engagement with the Wall of the casing, a tubular mandrel slidably extending throughout the length of said body and said sleeve, said mandrel adapted to be connected to a string of pipe for raising, lowering, and manipulating the well packer 'in said casing, an unrestricted passageway between the Vmandrell and the b'ody,rst and second enlargements rigidly mounted lon the mandrel exteriorly of and spaced Vfrom opposite Aends vof the body for engaging each such end for moving the Ibody relative to the sleeve member, at least aportion of the second enlargement being internally receivable within the sleeve member, coacting and engageable valve'surfaces on each enlargement and each end of the body for selectively closing the passageway at each Vend on reciprocation of the mandrel relative to the body, yieldable means between the second enlargement and the body yieldably separating the engageable valve surfaces on the second enlargement and body, expansible latch means yieldingly mounted on said second enlargement, engageable thread means on said latch means and on the sleeve member threadedly locking the mandrel and sleeve member against relative longitudinal movement'in one direction, said latch means being disengageable on rotation of the mandrel relative to the sleeve member and engageable by longitudinal movement of Athe sleeve member relative to the mandrel in the other direction, and friction means cooperating With the sleeve member yieldingly and frictionally engaging said wall of the casing for holding the sleeve member substantially stationary during movement of said mandrel when the latch means is released from the sleeve member.

2. A well packer for use in casing comprising, a generally tubular body, a packer element secured about the body, a-sleeve member slidably disposed about the body and extending beyond one end thereof, slips secured to the sleeve member and disposed about the body for radial expansion and contraction into and out of frictional engagement with an inner wall of the casing, a slip expander slidably secured to the body and engaging the slips, said slip expander `and slips having guide and slide surfaces for such radial expansion and contraction of said slips upon relative movement of the slip expander and the slips, shoulders on the body and the slip expander abutting and confining the packer element whereby upon relative movement of said body and sleeve member in one direction said slips are expanded radially into such frictional engagement with the wa'll of the casing thereby xing said slip expander against further movement in said one direction, continued movement of said body in said one direction compressing said packer element between said Shoulders and expanding the packer element into sealing engagement with said wall of the casing, a tubular mandrel slidably extending throughout the length of said body and `said sleeve member, said mandrel adapted to be connected to a string of pipe for raising, lowering, and manipulating the well packer in said casing, an unrestricted passageway between the mandrel and the body, rst and second enlargements rigidly mounted on the mandrel exteriorly of and spaced from opposite ends of the Ibody for engaging each such end for moving the b ody relative to the sleeve member, a portion of the second enlargement being internally receivable within the sleeve member, coacting and engageable valve surfaces on each enlargement and each end of the body for selectively closing the passageway at each end on reciprocation of `the mandrel relative to the body, internal threads on the sleeve member, expansible latch means yieldingly mounted on said second enlargement, threads on said latch means .complementary to and engageable with the internal threads on the sleeve member threadedly locking the mandrel and sleeve against relative longitudinal movement in one direction, said threads being disengageable upon relative rotation of the mandrel `and the sleeve member and engageable upon relative movement of the mandrel and the sleevefmember in the other direction, a perforate stop member slidably carried by the mandrel, means yieldingly urging the stop member against the valve surface on the body adjacent the second enlargement when the latch means is engaged, engagement of Vsaid valve surfaces adjacent the stop member closing the v perforations thereof, and friction means cooperating with the sleeve member yieldingly and frictionally engaging said wall of the casing for holding the sleeve member `substantial-ly stationary during the movement of said mandrel when the latch means is not engaged.

3. A well packer comprising a generally tubular body, said body having a reduced external diameter section eX- tending downwardly from an upper portion, a packing -band secured about the body above the reduced section, a sleeve member slfidably disposed about the reduced diameter section of the body below the packing band and extending 'below the lower end thereof, slips secured to the sleeve member for radial expansion and contraction into and out of frictional engagement with an inner wall of a casing, a slip expander slida'bly secured to the 'body yand engaging the slips, said slip expander and slips having guide 'and slide surfaces for such radial expansion and contraction of said slips, shoulders on the body and slipv expander abutting and confining the packing band where- -by upon rela-tive movement of said body with respect to said sleeve memlber said slips are expanded into said f-rictiona'l engagement thereby fixing said slip expander against lfurther downward movement, continued downward movement of said body compressing said packing band between said shoulders thereby expanding the packing band into sealing engagement with said inner wall of the casing, 'a tubular mandrel slidably extending throughout the length of said body and said sleeve member adapted to be connected to a string of pipe for raising, lowering and manipulating the well packer in said casing, an unrestricted annular passageway between the mandrel and the Ibody for circulation of drill fluid, first and second enlargements rigidly mounted on the mandrel exteriorly of and spaced from opposite ends of the body for engaging each such end for moving the body relative to the sleeve member, at least a portion of the second enlargement being internally receivable the sleeve member, complementary hammer and anvil surfaces on the second enlargement and on the lower end of the body respectively to jar said body upwardly relative to said sleeve member upon sharp upwa-rd movement of said mandrel, expansi-ble latch means yieldingly mounted on said second enlargement, and complementary and engageable threads on said latch means and on the sleeve memvber threadedly locking the mandrel to the sleeve member against relative downward movement, said threads being disengageable vby relative rotation of the mandrel and the sleeve member and engageable by movement of the mandrel in an upward direction relative to the sleeve member, -a perforate member slidably carried by the mandrel communicating with the passageway, and yieldable means urging the perforate member against the anvil surface when the threads are engaged, engagement of the hammer and anvil surfaces closing perforations of the perforate member.

4. The well packer of claim 3 including stop means for limiting upward movement of the mandrel relative to the sleeve member after contact of the complementary hammer and anvil surfaces during upward movement of the mandrel.

5. The well packer of claim 4 where the hammer and anvil sur-face comprise engageaible valve surfaces on the `second enlargement and at the lower end of the vbody closing the passageway upon engagement of such valve surfaces.

6. The well packer of claim l where the second enlargement includes la downwardly facing .pressure surface whereby lluid pressure circulated downwardly through the mandrel may -be directed upwardly against the pressure surface for facilitating upward movement of the body and release of the packing band and slips.

Nixon July 27, 1929 Brumuy De. .5, 1939 

